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Complex salts of Sulphato-compounds of Arsenic

Complex salts containing arsenic tri- or pent-oxide and sulphurtrioxide, apparently in a complex anion, have been described. The following are examples:

2K2O.As2O3.4SO3Prepared by heating solutions of the metallic sulphate and arsenious oxide in concentrated sulphuric acid.
2K2O.As2O5.2SO3.3H2OObtained from solutions of the alkali dihydrogen orthoarsenate in sulphuric acid.
3Ag2O.As2O5.SO3Obtained by dissolving silver orthoarsenate in sulphuric acid

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